Automatic milk preparing device

ABSTRACT

An automatic milk preparing device is provided, including a microcontroller fixed in the automatic milk preparing device for controlling the operation of same, a powder box connected with the microcontroller and provided with a powder output gate in the front of the powder box for controlling the powder to be added according to the signal from the microcontroller, a water tank connected with the microcontroller for controlling the water to be added according to the signal from the microcontroller, a stirring structure fixed under the powder output gate, connected with the water tank through a first water pipe and provided with a milk outlet at the lower part of the stirring structure, and a weight measuring structure fixed below the stirring structure and connected with the microcontroller for laying a milk bottle, weighing water and/or milk powder in the bottle and feeding the result of weight back to the microcontroller.

FIELD OF THE INVENTION

The present invention relates to the field of household appliances indaily life, and particularly to an automatic milk preparing device.

BACKGROUND OF THE INVENTION

In life, most of families feed infants or young children with formulamilk powder. Many problems exist during preparing milk.

(1) The temperature of water for preparing milk scientifically should bein the range of 45-55° C. When preparing milk in this range oftemperature, the nutrient composition in milk powder will not bedestroyed, and it is also a suitable temperature for drinking. However,when manually preparing milk, it is difficult to control the temperatureof water, and the temperature of water is often too high or too low.

(2) To feed infants or young children in a scientific manner, it isnecessary to prepare milk according to the ratio required by thestandard of formula milk powder. However, when manually preparing milk,it is difficult to control the amount of powder and water accurately.When there is too much powder, the milk liquid will be too thick,leading to poor digestion for infants or young children. When there istoo little powder, the milk liquid will be too thin, leading to poornutrition for infants or young children.

(3) In case that the milk powder is exposed to the air for a long timeor contacts with hands, bacteria may breed in the milk powder and leadto cross infection. Firstly, during preparing milk each time, it isnecessary to open the powder box, and the milk powder is frequentlyexposed to the air for long terms and large areas. As a result, thebacteria in the air may invade the milk powder, and cause the milkpowder to deteriorate, which is not favorable for preserving the milkpowder. Secondly, during taking the milk powder, it is often necessaryto put a spoon into the milk box by hand, thus the bacteria on the handmay propagate to the milk powder, leading to cross infection duringfeeding infants or young children. In order to store the milk powderhygienically, this case should be avoided as much as possible.

(4) The scientific method for preparing milk is to put a little waterinto a container, and then add milk powder and additional watersequentially or simultaneously. However, this is hardly realized whenpreparing milk manually.

(5) The scientific method for blending the milk liquid should avoidshaking violently which easily induce a lot of bubbles in the liquid.However, during to manually preparing milk, people usually shake themilk bottle hard with hands, leading to the production of a lot ofbubbles in the milk liquid. When fed with such milk, the infants oryoung children may suffer from abdominal flatulence, vomiting or crying.

(6) To ensure health and safety, the milk bottle should be sterilizedwith physical methods after each use. In the reality, it is generallysterilized by soaking in boiling water or by boiling, which is time andlabor consuming.

(7) In the fast-paced life, the modern people may desire a prompt,convenient, fast, and safe manner to prepare milk. Preparing milk in acumbersome manner frequently may lead to insomnia and amnesia for anadult and crying of infants or young children, which makes peoplementally and physically exhausted and affects the quality of lifeseriously.

To sum up, there are obviously inconveniences and defects in theexisting milk preparing device during actual use, and there is necessityfor improvement.

SUMMARY OF THE INVENTION

In view of the above defects, the object of the present invention is toprovide an automatic milk preparing device, which can accurately controlthe weight of milk powder and water and allow the milk to be prepared ina more scientific manner.

To achieve the above objects, the present invention provides anautomatic milk preparing device, comprising: a microcontroller, which isfixed in the automatic milk preparing device for controlling theoperation of the automatic milk preparing device; a powder box, which isconnected with the microcontroller and provided with a powder outputgate in the front of the powder box, for controlling the powder to beadded according to the signal from the microcontroller; a water tank,which is connected with the microcontroller for controlling the water tobe added according to the signal from the microcontroller; a stirringstructure, which is fixed below the powder output gate, connected withthe water tank through a first water pipe, and provided with a milkoutlet at the lower part of the stirring structure; a weight measuringstructure, which is fixed below the stirring structure and connectedwith the microcontroller for laying a milk bottle, weighing water and/ormilk powder in the milk bottle, and feeding the result of weight back tothe microcontroller. Herein, the milk powder and water are fed into thestirring structure from the powder box and the water tank respectivelyfor stirring, and flow into the milk bottle through the milk outlet ofthe stirring structure, and the microcontroller controls the weight ofwater and/or powder to be added for next time according to the weight ofwater and/or milk powder in the milk bottle.

According to the automatic milk preparing device of the presentinvention, the microcontroller controls the water tank to add water forthe first time, the weight measuring structure weighs water in the milkbottle and feeds the result of weight back to the microcontroller; themicrocontroller controls the powder box to add powder for the first timeand the water tank to add water for the second time, the weightmeasuring structure weighs milk liquid in the milk bottle and feeds theresult of weight back to the microcontroller; the microcontrollercontrols the powder box to add powder for the second time and the watertank to add water for the third time. The addition of the powder andwater can be performed for several times.

According to the automatic milk preparing device of the presentinvention, the microcontroller calculates the flowrate of water to beadded according to the time period of the first water addition and theweight of water in the milk bottle; and the microcontroller controls theamount of water to be added by the water tank for the second and thirdtimes according to the flowrate of the first water addition.

According to the automatic milk preparing device of the presentinvention, the microcontroller calculates the flowrate of powder to beadded according to the time of the first powder addition by the powderbox and the weight of milk powder in the milk bottle; and themicrocontroller controls the amount of powder to be added by the powderbox for the second time according to the flowrate of the first powderaddition.

According to the automatic milk preparing device of the presentinvention, the weight measuring structure comprises a pressure sensorconnected with the microcontroller.

According to the automatic milk preparing device of the presentinvention, the stirring structure is funnel shaped, and provided on theside wall with a water inlet connected with the first water pipe.

According to the automatic milk preparing device of the presentinvention, there is a powder adding transmission structure provided inthe powder box. The powder adding transmission structure comprises aworm with a helical structure, at least one turbine, and a first motorfor driving the worm to rotate; and one end of the worm is located abovethe powder output gate of the powder box, and the other end is connectedwith the motor.

According to the automatic milk preparing device of the presentinvention, there are a plurality of teeth engaging with the wormprovided at the edge of the turbine, and the worm drives the turbine torotate; and there are a plurality of stirring pieces for stirring milkpowder provided on the turbine, and milk powder is transferred to thepowder output gate by means of engagement between the worm and theturbine.

According to the automatic milk preparing device of the presentinvention, there are magnets which cooperate with each other provided onthe powder output gate of the powder box and the worm, respectively.

According to the automatic milk preparing device of the presentinvention, the powder output gate is opened when the powder is addedfrom the powder box; and the powder output gate is closed when powderadding is finished.

According to the automatic milk preparing device of the presentinvention, the microcontroller controls the motor to drive the worm torotate, and to transfer milk powder to the powder output gate by meansof engagement between the worm and the turbine, while the magnet on theworm and the magnet on the powder output gate open the powder outputgate by means of magnetic interaction; and the microcontroller controlsthe motor to rotate inversely by a predetermined angle, while the magneton the worm and the magnet on the powder output gate close the powderoutput gate by means of magnetic interaction.

According to the automatic milk preparing device of the presentinvention, the automatic milk preparing device further comprises alifting controller connected with the weight measuring structure forlifting up or down the milk bottle according to the signal from themicrocontroller.

According to the automatic milk preparing device of the presentinvention, the lifting controller comprises a second motor for drivingthe lifting controller to work.

According to the automatic milk preparing device of the presentinvention, the lifting controller further comprises at least oneposition controlling structure arranged at the periphery of the milkoutlet of the stirring structure, for sensing the position of the mouthof the milk bottle and feeding it back to the microcontroller.

According to the automatic milk preparing device of the presentinvention, when there is some distance between the mouth of the milkbottle and the milk outlet, the microcontroller controls the liftingcontroller to lift up the milk bottle; and when the mouth of the milkbottle is flush with the milk outlet, the microcontroller controls thelifting controller to maintain the current position of the milk bottle.

According to the automatic milk preparing device of the presentinvention, the automatic milk preparing device further comprises a heatradiating structure, and the heat radiating structure is connected withthe water tank through the second and third water pipes.

According to the automatic milk preparing device of the presentinvention, the heat radiating structure comprises a housing, at leastone fan arranged on the housing, and a helical pipe connected with thesecond and third water pipes.

According to the automatic milk preparing device of the presentinvention, there are water pumps provided on the water tank, which areconnected with the first and second water pipes, respectively.

According to the automatic milk preparing device of the presentinvention, there is a heating plate provided at the bottom of the watertank, which is connected with the microcontroller.

According to the automatic milk preparing device of the presentinvention, there is a temperature sensor provided in the water tank,which is connected with the microcontroller.

According to the automatic milk preparing device of the presentinvention, the temperature sensor detects the temperature of water inthe water tank and feeds it back to the microcontroller, and when thetemperature of water is higher than a predetermined temperature, themicrocontroller controls the water tank to stop heating and the heatradiating structure to start work; and when the temperature of water islower than the predetermined temperature, the microcontroller controlsthe water tank to heat and the heat radiating structure to stop work.

According to the automatic milk preparing device of the presentinvention, the automatic milk preparing device further comprises asterilizing chamber connected with the water tank; there is a solenoidvalve provided between the sterilizing chamber and the water tank, thesolenoid valve is connected with the water tank and the sterilizingchamber through the fourth and fifth water pipes respectively, and thereis a heating plate provided at the bottom of the sterilizing chamber.

According to the automatic milk preparing device of the presentinvention, the automatic milk preparing device further comprises an LCDdisplay device which is connected with the microcontroller.

According to the automatic milk preparing device of the presentinvention, the powder box further comprises a cover with a buckle, andthe cover is provided with a ring seal.

The present invention provide a weight measuring structure which isbelow the stirring structure and connected with the microcontroller, andused for laying a milk bottle, weighing water and/or milk powder in themilk bottle, and feeding the result of weight back to themicrocontroller. The microcontroller calculates and controls the amountof water and powder to be added for the next time according to theweight of the water or milk liquid within the milk bottle, so that thefinal ratio of milk powder to water in the milk liquid is reasonable.Thereby, the present invention can accurately control the ratio betweenmilk powder and water so as to achieve a more scientific manner forpreparing milk.

Preferably, the stirring structure of the present invention is funnelshaped and provided on the side wall with a water inlet, and the milkpowder falls into the stirring structure directly from the powder outputgate; while the powder is added, water horizontally flows into the innerwall of the stirring structure from the water inlet, and quickly formrotation in the stirring structure. The impulsive force of water notonly results in quick blend of the milk powder and water duringrotation, but also has the function of stirring, and the milk liquidflows out of the stirring structure via the milk outlet, thus achievingthe purpose of quickly dissolving the milk powder, and preventing theformation of a lot of bubbles in the milk liquid, which are easilyformed when the milk is shaken violently by hand.

There is a worm and a turbine provided in the powder box according tothe present invention. When the powder is added, the microcontrollercontrols the motor to drive the worm to rotate, and to transfer milkpowder to the powder output gate by means of engagement between the wormand the turbine, while the magnet on the worm and the magnet on thepowder output gate open the powder output gate by means of magneticinteraction; after powder adding is finished, the microcontrollercontrols the motor to rotate inversely by a predetermined angle, themagnet on the worm and the magnet on the powder output gate close thepowder output gate by means of magnetic interaction. Thereby, thepresent invention prevents the milk powder from exposing to the airfrequently for long times and in large areas, allowing the milk powdernot to be deteriorated due to invasion of bacteria from the air.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural view showing an embodiment of an automatic milkpreparing device of the present invention;

FIG. 2 is a structural diagram showing the circuit principle of theautomatic milk preparing device of the present invention;

FIG. 3 is a flow chart of preparing milk using the automatic milkpreparing device of the present invention;

FIG. 4 is a flow chart of controlling water addition by amicrocontroller in the automatic milk preparing device of the presentinvention;

FIG. 5 is a flow chart of controlling powder addition by amicrocontroller in the automatic milk preparing device of the presentinvention;

FIG. 6 is a cross sectional view showing a powder box in the automaticmilk preparing device of the present invention;

FIG. 7 is a structural view showing engagement between a worm and aturbine in the automatic milk preparing device of the present invention;

FIG. 8 is a structural view showing a stirring structure in theautomatic milk preparing device of the present invention;

FIG. 9 is a structural view showing cooperation between a weightmeasuring structure and a lifting controller in the automatic milkpreparing device of the present invention;

FIG. 10 is a structural view showing cooperation among a weightmeasuring structure, a lifting controller, and a position controllingstructure in the present invention;

FIG. 11 is a perspective view showing a heat radiating structure in theautomatic milk preparing device of the present invention;

FIG. 12 is a top view showing the heat radiating structure in theautomatic milk preparing device of the present invention;

FIG. 13 is a perspective view showing a helical pipe of the heatradiating structure in the automatic milk preparing device of thepresent invention;

FIG. 14 is a cross sectional view showing a sterilizing chamber and awater tank in the automatic milk preparing device of the presentinvention; and

FIG. 15 is a perspective view showing the sterilizing chamber and thewater tank in the automatic milk preparing device of the presentinvention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to appreciate the objects, technical solutions, and advantagesof the present invention more clearly, the present invention willfurther be described hereinafter with reference to the accompanyingdrawings and the embodiments. It is appreciated that the particularembodiments are provided only for illustrating the present invention andshould not be construed as limiting the present invention.

As shown in FIGS. 1 and 2, an automatic milk preparing device 100according to the present invention comprises a microcontroller 10 forcontrolling the operation of the automatic milk preparing device 100, apowder box 20, a water tank 30, a stirring structure 40, and a weightmeasuring structure 50. The microcontroller 10 is fixed in the automaticmilk preparing device 100, and is electrically connected with the powderbox 20, the water tank 30 and the weight measuring structure 50. Asshown in FIGS. 1-2, 6, and 8-9, a powder output gate 201 is provided inthe front of the powder box 20, and the powder box 20 controls thepowder addition through the powder output gate 201 according to thesignal from the microcontroller 10. The water tank 30 is used to storewater and control the water addition according to the signal from themicrocontroller 10. On the bottom of the water tank 30 there is aheating plate connected with the microcontroller 10 for heating water inthe water tank 30 according to the signal from the microcontroller 10. Astirring structure 40 is fixed below the powder output gate 201,connected with the water tank 30 through a first water pipe 301, andprovided with a milk outlet 401 at the lower part of the stirringstructure. A weight measuring structure 50 is fixed below the stirringstructure 40 for laying a milk bottle 200, weighing water and/or milkpowder in the milk bottle 200, and feeding the result of weight back tothe microcontroller 10. The weight measuring structure 50 comprises apressure sensor connected with the microcontroller 10, and weighs waterand/or milk powder in the milk bottle 200 by means of the pressuresensor.

Here, the milk powder and water are fed into the stirring structure 40from the powder box 20 and the water tank 30 respectively for stirring,and then flow into the milk bottle 200 through the milk outlet 401 ofthe stirring structure 40. The microcontroller 10 controls the weight ofwater to be added by the water tank 30 and/or powder to be added by thepowder box 20 for the next time according to the weight of water and/ormilk powder in the milk bottle 200, so that the ratio of milk powder towater in the milk liquid is reasonable and scientific. Thereby, thepresent invention can accurately control the ratio between milk powderand water so as to achieve a more scientific manner for preparing milk.

As shown in FIGS. 2 and 3, the automatic milk preparing device 100 mayprepare milk by the followings steps.

S301, the microcontroller 10 controls the water tank 30 to add water forthe first time; and the weight measuring structure 50 weighs water inthe milk bottle 200 and feeds the result of weight back to themicrocontroller 10.

S302, the microcontroller 10 controls the powder box 20 to add powderfor the first time and the water tank 30 to add water for the secondtime; and the weight measuring structure 50 weighs milk liquid in themilk bottle 200 and feeds the result of weight back to themicrocontroller 10.

S303, the microcontroller 10 controls the powder box 20 to add powderfor the second time and the water tank 30 to add water for the thirdtime. Clearly, the addition of powder and water can be performed forseveral times.

As shown in FIG. 4, step S301 may further comprise the following steps.

S401, the microcontroller 10 calculates the flowrate of water to beadded according to the time of the first water addition and the weightof water in the milk bottle 200. The flowrate of water to be added iscalculated as the weight of water in the milk bottle 200 divided by thetime of the water addition, thus obtaining the weight of water to beadded per unit time.

S402, the microcontroller 10 controls the amount of water to be added insteps S302 and S303 according to the flowrate of the first wateraddition.

As shown in FIG. 5, step S302 may further comprise the following steps.

S501, the microcontroller 10 calculates the flowrate of powder to beadded according to the time of the first powder addition by the powderbox 20 and the weight of powder in the milk bottle 200. The flowrate ofpowder to be added is calculated as the weight of powder in the milkbottle 200 divided by the time of the powder addition, thus obtainingthe weight of powder to be added per unit time.

S502, the microcontroller 10 controls the weight of powder to be addedin step S303 according to the flowrate of the first powder addition.

In step S302, the weight of milk powder in the milk bottle 200 is theweight of milk liquid in the milk bottle 200 minus the weight of waterin the milk bottle 200. And the weight of water may be calculated as theflowrate calculated during the first water addition multiplied by thetime of water addition.

In step S303, the microcontroller 10 calculates the weight of water andmilk powder which is further needed according to the weight of water andthe weight of milk powder in the milk liquid, and accurately controlsthe time of the second powder addition and the time of the third wateraddition according to the flowrate of water addition and the flowrate ofpowder addition calculated in steps S301 and S302 so as to achieve anaccurate ratio of water to powder in the milk liquid.

As shown in FIGS. 1 and 2, the automatic milk preparing device 100according to the present invention further comprises a liftingcontroller 60, a position controlling structure 61, a sterilizingchamber 70, a heat radiating structure 80, and an LCD display device 90,each of which is electrically connected with the microcontroller 10.

As shown in FIGS. 6 and 7, a powder adding transmission structure 202 isprovided in the powder box 20. The powder adding transmission structure202 comprises a worm 2021 defining a helical structure, at least oneturbine 2022, and a first motor 2023 for driving the worm 2021 torotate. One end of the worm 2021 is located above the powder output gate201 of the powder box 20, and the other end is connected with the firstmotor 2023. The edge of the turbine 2022 is provided with a plurality ofteeth 2024 engaging with the worm 2021, and the worm 2021 drives theturbine 2022 to rotate by engagement between the teeth 2024 and the worm2021 defining a helical structure. Also, the turbine 2022 is providedwith a plurality of stirring pieces 2025 for stirring milk powder. Thestirring pieces 2025 stir the powder in the powder box 20 and it isfavorable to keep the powder fresh. The milk powder in the powder box 20is transferred to the powder output gate 201 by means of engagementbetween the worm 2021 and the turbine 2022. Magnets which cooperate witheach other are provided on the powder output gate 201 of the powder box20 and the worm 2021, respectively. Preferably, the magnet for the worm2021 is arranged at the end of the worm 2021 which is close to thepowder output gate 201.

When it is required to add powder, the microcontroller 10 controls thefirst motor 2023 to drive the worm 2021 to rotate, and to transfer themilk powder to the powder output gate 201 by means of engagement betweenthe worm 2021 and the turbine 2022. Meanwhile, the magnet on the worm2021 and the magnet on the powder output gate 201 open the powder outputgate 201 by means of magnetic interaction; after adding powder, themicrocontroller 10 controls the first motor 2023 to rotate inversely bya predetermined angle. When the first motor 2023 rotates by apredetermined angle, the worm 2021 also rotates by a predeterminedangle, so that the magnetic pole of the magnet on the worm 2021 changesand the powder output gate 201 is closed by means of magneticinteraction between the magnet on the worm 2021 and the magnet on thepowder output gate 201.

According to the present invention, the powder output gate 201 is onlyopened when it is required to add powder, and the powder output gate 201is closed automatically when the powder adding is complete. In this way,it is possible to prevent the water vapor from entering the powder box20 through the powder output gate 201 and thus contacting the powder.Besides, it is possible to prevent the bacteria in the air from invadingthe milk powder. Preferably, the powder box 20 further comprises a topcover 203 with a buckle, and the cover 203 is provided with a ring seal.Thereby, the present invention is favorable to the preservation of themilk powder.

As shown in FIGS. 1, 6, and 8-9, the stirring structure 40 is funnelshaped, and provided on its side wall with a water inlet 402 connectedwith the first water pipe 301. During preparing milk, the milk powderfalls into the stirring structure 40 directly from the powder outputgate 201. Meanwhile, the water tank 30 horizontally feeds water into thestirring structure 40 through the water inlet 402, and the water quicklyforms a rotation movement along the funnel shaped stirring structure 40.In this way, the impulsive force of water not only allows milk powderand water to be blended quickly during rotation in the funnel, but alsohas the function of stirring. Then, the milk liquid flows out of thestirring structure 40 via the milk outlet 401, achieving the purpose ofquickly dissolving the milk powder, and preventing the formation of alot of bubbles in the milk liquid, which are easily formed when the milkis shaken violently by hand.

As shown in FIGS. 2 and 9, the automatic milk preparing device 100further comprises a lifting controller 60 connected with the weightmeasuring structure 50. The weight measuring structure 50 is used forlaying the milk bottle 200, and the lifting controller 60 lifts up ordown the milk bottle 200 according to the signal from themicrocontroller 10.

As shown in FIG. 10, the lifting controller 60 further comprises atleast one position controlling structure 61 arranged at the periphery ofthe milk outlet 401 of the stirring structure 40 and a second motor 601for driving the lifting controller 60 to work. The position controllingstructure 61 senses the position of the mouth of the milk bottle 200 andfeeds it back to the microcontroller 10. During preparing milk, whenthere is some distance between the mouth of the milk bottle 200 and themilk outlet 401, in order to prevent milk liquid from splashing from themilk bottle 200, the microcontroller 10 will control the liftingcontroller 60 to lift up the milk bottle 200. When the mouth of the milkbottle 200 is flush with the position of the milk outlet 401, themicrocontroller 10 will control the lifting controller 60 to maintainthe milk bottle 200 at the current position for preparing milk; and whenmilk preparing is finished, the microcontroller 10 will control thelifting controller 60 to lift down the milk bottle 200. Obviously, theremay be provided with one or more position controlling structures 61.

As shown in FIGS. 1-2, and 11-13, the automatic milk preparing device100 further comprises a heat radiating structure 80. The heat radiatingstructure 80 is connected with the water tank 30 through the secondwater pipe 302 and the third water pipe 303. The heat radiatingstructure 80 comprises a housing 801, at least one fan 802 arranged onthe housing 801, and a helical pipe 803 connected with the second waterpipe 302 and the third water pipe 303. The heat radiating structure 80is used to cool the boiling water in the water tank 30 to apredetermined temperature for preparing milk. There may be provided withone or more fans 802, and preferably two fans.

The water tank 30 is provided with water pumps 3011 and 3021, which areconnected with the first water pipe 301 and the second water pipe 302,respectively. During radiating heat, the microcontroller 10 controlswater pump 3021 to transfer water in the water tank 30 to the heatradiating structure 80 through the second water pipe 302, reduce thetemperature of boiling water in the water tank 30 by means of the fan802 and the helical pipe 803, and then return the water to the watertank 30 through the third water pipe 303.

A temperature sensor is further provided in the water tank 30. Thetemperature sensor is connected with the microcontroller 10, detects thetemperature of water in the water tank 30 and feeds it back to themicrocontroller 10. When the temperature of water is higher than apredetermined temperature, the microcontroller 10 controls the heatingplate in the water tank 30 to stop heating, and the heat radiatingstructure 80 starts to work at the same time. When the temperature ofwater is lower than a predetermined temperature, the microcontroller 10controls the heating plate in the water tank 30 to heat, and the heatradiating structure 80 stops working at the same time.

Preferably, when the water reaches a temperature of the predeterminedtemperature +2° C. (an upper limit), the heating plate stops heating.When the water reaches a temperature of a predetermined temperature −2°C. (a lower limit), the heating plate starts to heat. In this way, thetemperature of water can be constantly maintained at the predeterminedtemperature ±2° C. so as to prepare milk properly.

As shown in FIGS. 1-2, and 14-15, the automatic milk preparing device100 further comprises a sterilizing chamber 70 connected with the watertank 30. A solenoid valve 701 is provided between the sterilizingchamber 70 and the water tank 30. The solenoid valve 701 is connectedwith the water tank 30 and the sterilizing chamber 70 through the fourthwater pipe 304 and the fifth water pipe 305, respectively. Thesterilizing chamber 70 is further provided with a shelf 702 for layingnipples. When it is required to sterilize, the microcontroller 10controls the solenoid valve 701 to open, allowing water in the watertank 30 to enter into the sterilizing chamber 70. There is a heatingplate at the bottom of the sterilizing chamber 70. Water in thesterilizing chamber 70 is heated to its boiling temperature with theheating plate, and the milk bottle 200 and nipples in the sterilizingchamber 70 are sterilized by the high-temperature water vapor. Ofcourse, it is also possible to use other sterilizing methods, such asboiling or ultraviolet sterilization.

Preferably, the automatic milk preparing device 100 according to thepresent invention further comprises an LCD display device 90 connectedwith the microcontroller 10. By means of the LCD display device 90, theuser may operate the automatic milk preparing device 100. Meanwhile, thepresent invention also provides a speaker connected with themicrocontroller 10. The speaker may remind the user to prepare and feedmilk to infants or young children periodically according to thepredetermined schedule by the microcontroller 10.

According to the present invention, it is possible to realizesterilizing the milk bottle 200, storing the milk powder hygienically,maintaining a constant temperature of water, weighing water and milkpowder automatically and accurately, and integrated preparing andstirring in an automatic and scientific manner. Besides, it is possibleto prepare milk in a simple, hygienical, safe and fast manner. Thepresent application is also applicable for preparing drinks with variouspowder and particles. Under control of the microcontroller 10, one-touchpreparing is possible, which is simple, fast, and hygienical inoperation.

In summary, the present invention provide a weight measuring structurewhich is below the stirring structure and connected with themicrocontroller, and used for laying a milk bottle, weighing waterand/or milk powder in the milk bottle, and feeding the result of weightback to the microcontroller. The microcontroller calculates and controlsthe amount of water and powder to be added for the next time accordingto the weight of the water or milk liquid within the milk bottle, sothat the final ratio of milk powder to water in the milk liquid isreasonable. Thereby, the present invention can accurately control theratio between milk powder and water so as to achieve a more scientificmanner for preparing milk.

Preferably, the stirring structure of the present invention is funnelshaped and provided on the side wall with a water inlet, and the milkpowder falls into the stirring structure directly from the powder outputgate; while the powder is added, water horizontally flows into the innerwall of the stirring structure from the water inlet, and quickly formrotation in the stirring structure. The impulsive force of water notonly results in quick blend of the milk powder and water duringrotation, but also has the function of stirring, and the milk liquidflows out of the stirring structure via the milk outlet, thus achievingthe purpose of quickly dissolving the milk powder, and preventing theformation of a lot of bubbles in the milk liquid, which are easilyformed when the milk is shaken violently by hand.

There is a worm and a turbine provided in the powder box according tothe present invention. When the powder is added, the microcontrollercontrols the motor to drive the worm to rotate, and to transfer milkpowder to the powder output gate by means of engagement between the wormand the turbine, while the magnet on the worm and the magnet on thepowder output gate open the powder output gate by means of magneticinteraction; after powder adding is finished, the microcontrollercontrols the motor to rotate inversely by a predetermined angle, themagnet on the worm and the magnet on the powder output gate close thepowder output gate by means of magnetic interaction. Thereby, thepresent invention prevents the milk powder from exposing to the airfrequently for long times and in large areas, allowing the milk powdernot to be deteriorated due to invasion of bacteria from the air.

The present invention certainly has many other embodiments. Variousmodifications and variations may made based on the present invention bythe person skilled in the art without departing from the spirit andnature of the present invention, and such modifications and variationsshould fall within the scope of the present invention which is definedonly by the appended claims.

What is claimed is:
 1. An automatic milk preparing device, comprising: amicrocontroller fixed in the automatic milk preparing device forcontrolling the operation of the automatic milk preparing device; apowder box connected with the microcontroller and provided with a powderoutput gate in the front of the powder box for controlling milk powderto be added according to a signal from the microcontroller; a powderadding transmission structure in the powder box, the powder addingtransmission structure including a worm with a helical structure, atleast one turbine, and a motor for rotating the worm, wherein one end ofthe worm is located above the powder output gate of the powder box, andanother end is connected with the motor; a plurality of teeth engagingwith the worm provided at the edge of the at least one turbine, whereinthe worm drives the turbine to rotate; a plurality of several stirringpieces for stirring the milk powder provided on the at least oneturbine, wherein the milk powder is transferred to the powder outputgate by engagement between the worm and the at least one turbine;magnets which cooperate with each other provided on the powder outputgate of the powder box and the worm respectively; a water tank connectedwith the microcontroller for controlling the water to be added accordingto the signal from the microcontroller; a stirring structure fixed belowthe powder output gate, connected with the water tank through a firstwater pipe, and provided with a milk outlet at the lower part of thestirring structure; and a weight measuring structure fixed below thestirring structure and connected with the microcontroller for receivinga milk bottle, weighing at least one of water and milk powder in themilk bottle, and feeding the result of weight back to themicrocontroller; wherein, the at least one of the water and the milkpowder are fed into the stirring structure from the powder box and thewater tank respectively for stirring, and flow into the milk bottlethrough the milk outlet of the stirring structure, and themicrocontroller controls the weight of the at least one of the water andthe milk powder to be added for a next time according to the weight ofthe at least one of the water and the milk powder in the milk bottle,wherein the microcontroller: controls the water tank to add water for afirst time, and the weight measuring structure weighs water in the milkbottle and feeds the result of weight back to the microcontroller;controls the powder box to add milk powder for the first time and thewater tank to add water for a second time, and the weight measuringstructure weighs milk liquid in the milk bottle and feeds the result ofweight back to the microcontroller; controls the powder box to add milkpowder for the second time and the water tank to add water for a thirdtime, calculates the flowrate of water to be added according to the timeof a first water addition and the weight of water in the milk bottle;controls the amount of water to be added by the water tank for thesecond and third times according to the flowrate of the first wateraddition, calculates the flowrate of the milk powder to be addedaccording to the time of a first powder addition by the powder box andthe weight of milk powder in the milk bottle; and controls the amount ofthe milk powder to be added by the powder box for the second timeaccording to the flowrate of the first powder addition, wherein theaddition of the at least one of the water and the milk powder can beperformed for several times.
 2. The automatic milk preparing deviceaccording to claim 1, wherein the weight measuring structure comprises apressure sensor connected with the microcontroller.
 3. The automaticmilk preparing device according to claim 1, wherein the stirringstructure is funnel shaped and includes a side wall with a water inletwhich is connected with the first water pipe.
 4. The automatic milkpreparing device according to claim 1, wherein the powder output gate isopened when the powder is added from the powder box; and the powderoutput gate is closed when powder adding is finished.
 5. The automaticmilk preparing device according to claim 1, wherein the microcontrollercontrols the motor to drive the worm to rotate, and to transfer milkpowder to the powder output gate by means of engagement between the wormand the turbine, while the magnet on the worm and the magnet on thepowder output gate open the powder output gate by means of magneticinteraction; and the microcontroller controls the motor to rotateinversely by a predetermined angle, while the magnet on the worm and themagnet on the powder output gate close the powder output gate by meansof magnetic interaction.
 6. The automatic milk preparing deviceaccording to claim 1, further comprising a lifting controller connectedwith the weight measuring structure for lifting up or down the milkbottle according to the signal from the microcontroller.
 7. Theautomatic milk preparing device according to claim 1, further comprisinga heat radiating structure, the heat radiating structure is connectedwith the water tank through second and third water pipes, and the heatradiating structure comprises a housing, at least one fan arranged onthe housing, and a helical pipe connected with the second and thirdwater pipes.
 8. The automatic milk preparing device according to claim7, further comprising a sterilizing chamber connected with the watertank; a solenoid valve is provided between the sterilizing chamber andthe water tank; the solenoid valve is connected with the water tank andthe sterilizing chamber through fourth and fifth water pipesrespectively, and a heating plate is provided at the bottom of thesterilizing chamber.
 9. The automatic milk preparing device according toclaim 7, further comprising a temperature sensor provided within thewater tank, which is connected with the microcontroller.
 10. Theautomatic milk preparing device according to claim 9, wherein thetemperature sensor detects the temperature of water in the water tankand feeds it back to the microcontroller, and when the temperature ofwater is higher than a predetermined temperature, the microcontrollercontrols the water tank to stop heating and the heat radiating structureto start work; and when the temperature of water is lower than thepredetermined temperature, the microcontroller controls the water tankto heat and the heat radiating structure to stop working.